Synthesis of Terminal-Biradical Compounds Consisting of Two-N-Oxyl Groups Connected with Conjugatedp-Systmes

Torii, S.; Hase, T.; Kuroboshi, M.; Amatore, C.; Jutand, A.; Kawafuchi, H. Tetrahedron Lett. 1997, 38, 7391.

Terminal-biradical compounds 1 having two N-oxyl groups connected with conjugated p-systems were synthesized by (1) addition of magnesium acetylide to 4-oxo-TEMPO, followed by dehydration, or (2) cross-coupling between acetylene and vinyl trifate derived from 4-oxo-TEMPO.